turn on 意为“(把水龙头、煤气、电源等)打开”,其反义词组是turn off
Please turn on the light .
请打开灯。
It's too noisy .Please turn off the radio.
太吵了,请把收音机关 上。
turn up 意为“把收音机的音量等,开大,调高。其反义词组是turn down
We can't hear clearly .Please turn up the radio.
我们听不清,请把收音机的音量开大些。
You'd better turn down the radio a little .
你最好把收音机的音量关小点。